jasmine-ajax is a library that lets you define a set of fake responses for Ajax requests made by your application, specify per spec which response should be used, and keep track of the Ajax requests you make so you can make assertions about the results.

Download mock-ajax.js and add it to your project. If you are using the jasmine gem, be sure the location you put mock-ajax.js is included in your src_files path in jasmine.yml. If you are using Jasmine standalone, make sure you add it to your spec runner.

After signing up for an API key and playing around with curl a bit you should have an idea of what API resources you are interested in and what sample responses look like. Once you do, you can define simple JavaScripts objects that will be used to build XMLHttpRequest objects later.

Before you can specify that a request uses your test response, you must have a handle to the request itself. This means that the request is made first by the code under test and then you will set your test response (see next step).

Now that you've defined some test responses and installed the mock, you need to tell jasmine-ajax which response to use for a given spec. If you want to use your success response for a set of related success specs, you might use:

Most third-party Jasmine extensions use Ajax to load HTML fixtures into the DOM. Since jasmine-ajax intercepts all Ajax calls after it is installed, you need to load your fixtures before installing the mock. If you are using jasmine-jquery, that looks like this: